*{
	margin: 0;
	padding: 0;
	list-style: none;
}

.carousel{
	position: relative;
	/*设置与图片一样的宽度*/
	width: 520px; 
	overflow: hidden;
}
.carousel .inner{
	width: 9999px;
}
.carousel .inner::after{
	content: "";
	clear: both;
	display: block;
}
.inner .item{
	float: left;
}
.btn{
	position: absolute;
	width: 50px;
	height: 50px;
	top: 50%;
	margin-top: -25px;
	font-size: 50px;
	text-align: center;
	color: #fff;
	background-color: rgba(0,0,0,.7);
	line-height: 50px;
	cursor: pointer;
}
.leftBtn{
	left: 0;
}
.rightBtn{
	right: 0;
}
